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Figure 28. Manual frequency selector circuits, schematic diagram.
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TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
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Radio Set Control C-1439/U


d. The outputs of the 10-position, 1.0-mc
coils to be tuned from 20.0 to 29.9 mc.
and 0.1-mc automatic positioners are
0.1-mc steps.
combined through a gear train to control
e. The outputs of all three automatic
the rotation of a second tuning shaft within
positioners are combined by a gear train to
the first if. amplifier. This shaft is coupled
to the tuning coils of if. coil assemblies
control the rotation of the tuning shaft with-
in the rf and power amplifier subunit. Par-
2301 through 2306 (fig. 8). Because the
allel-tuned tank circuits Z101, Z103, Z105,
.1-mc automatic positioner turns 10 times
Z106, and Z107 and cavity resonator Z108
for each revolution of the 1.0-mc automatic
(fig. 5 and 19) are tuned from 399.9 to
positioner, the turning shaft can be ac-
225.0 mc, in 0.1-mc steps, by the rotation
curately turned to 100 positions in incre-
of the 1,800-position tuning shaft.
ments of 0.1-mc, which enables the tuning
Section VI. POWER SUPPLIES AND MINOR COMPONENTS
blower. Fuse F1802 protects the pri-
87. Power Supply PP-1494/U
mary windings of transformer T1801;
it is either a 1-1/2- or 3-ampere fuse,
Power Supply PP-1494/U operates on
depending on whether the operating voltage
115/230 volts ac, 50/60 cps, and supplies
is 230 or 115 volts ac. Fuse F1803 pro-
operating voltages for Receiver-Trans-
tects the primary windings of trans-
miter RT-441/TRC-68.
former T1802 and is either a 3/4- or a
1-1/2-ampere fuse.
a. Ac power is applied to power supply
c. A full-wave rectifier, which con-
input terminals 13 and 14 of plug 1801.
sists of diodes CR1801, CR1802, CR1803
When the ac power source voltage is 115
and CR1804, is connected across sec
volts switch S1803 is positioned as shown,
ondary winding terminals 5 and 6 of
and 115 volts ac is applied across the pri-
transformer T1801. This circuit pro-
mary windings (1-2 and 3-4) of trans-
vides +300 volts dc for the transmitter
former T1803 in parallel. When S1803
tubes and is protected by fuse F1806.
switch is in the 230-volt position, the pri-
Filtering is provided by reactors L1801
mary windings are in series and 115 volts
and L1802 and capacitor C1801. Capac-
ac is applied across each winding. Switches
itor C1802 is an additional filter in the
S1801 and S1802 perform the same function
+300-volt line. Diode CR1817, connected
for T1801 and T1802. The primary of T1803
across L1802, is a transient suppressor,
is connected to the ac power cord at all
and resistors R1801, R1802, R1804, and
times.
R1805 are bleeder resistors to ground.
d. A full-wave rectifier, which con-
b. Fuse F1801 is either 3- or 5-ampere,
depending on whether the source voltage is
sists of diodes CR1805, CR1806, CR1807,
230 or 115 volts ac. Fuse F1804 protects
and CR1808, is connected across sec-
the primary winding of transformer T1803.
ondary terminals 7 and 8 of transformer
A full-wave rectifier circuit, which con-
T1801. This circuit provides +26.4 volts
sists of diodes CR1813, CR1814, CR1815,
dc for the RT-441/TRC-68 and is protected
and CR1816, rectifies the output of trans-
by fuse F1805. When this voltage is sup-
former T1803 and applies +26.7 volts
plied, POWER indicator lamp I1801 lights.
across relay K1081. When relay K1801
e. Ac filament voltage is supplied to the
RT-441/TRC-68 from secondary taps 8, 9,
is energized (para 81), contacts B1 and
B2 and A1 and A2 close and the ac power
10, and 11 of transformer T1802. Full
source is applied to the primary wind-
wave rectifier, CR1809, CR1810, CR1811
ings of transformers T1801 and T1802.
and CR1812, is connected across trans-
Contacts D1 and D2 of K1801 close
former T1802 secondary terminals 5 and
and complete the ac circuit to the case
This circuit provides 115 volts dc across


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